package test0ne;

import java.util.HashMap;
import java.util.Map;

public class MapUtils {
    public static void main(String[] args) {
        Map<Integer, Integer> map = new HashMap<>();
        map.put(2,1);
        map.put(3,2);
        map.put(4,3);
        System.out.println(map.values());
        System.out.println(map.keySet());
        System.out.println(map.entrySet());
    }
}
